registered in 1992 by J.D. Jones. The .300 AAC Blackout was developed, documented and presented to SAAMI by Advanced Armament Corporation in 2009.

Next to the original 5.56mm NATO/223, the 300 AAC Blackout (BLK for short) is the most popular chambering for the AR-15 platform, and, as a result, manufacturers now pump out a wide variety of 300 ...

Building on the .45 Colt/.410 bore Brawler introduced in 2024, Rossi USA is expanding its line of break-action handguns to include chamberings in 5.56 NATO and .300 Blackout.